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Noncontrolling Interests (Narrative) (Details) - USD ($) $ in Millions					1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 12, 2024	Jan. 02, 2024	Nov. 12, 2022	Nov. 12, 2015	Feb. 28, 2023	Mar. 31, 2024	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Jan. 31, 2027	Nov. 14, 2022	Mar. 31, 2021	May 29, 2018
Redeemable Noncontrolling Interest [Line Items]
Purchase of noncontrolling interest		$ 194.1					$ 194.6	$ 36.5	$ 0.0
Other(1)							(93.2)	1.7	0.0
Incremental compensation expense						$ 49.2	49.2	0.0	0.0
Redeemable noncontrolling interest						123.3	123.3	343.6	321.2			$ 219.1
Purchase of noncontrolling interest							$ (194.6)	$ (55.1)	$ 0.0
Call period			30 days
3 Arts Entertainment
Redeemable Noncontrolling Interest [Line Items]
Deferred compensation arrangements													$ 38.3
Contingency period							5 years
Forecast
Redeemable Noncontrolling Interest [Line Items]
Call period	30 days
3 Arts Entertainment
Redeemable Noncontrolling Interest [Line Items]
Ownership percentage by noncontrolling owners													49.00%
Increase in ownership percentage		25.00%
Due to noncontrolling interest						93.2	$ 93.2
Other(1)							93.2
Redeemable noncontrolling interest						$ 93.2	$ 93.2
3 Arts Entertainment | Forecast
Redeemable Noncontrolling Interest [Line Items]
Noncontrolling owner's right to purchase remaining ownership interest of parent										24.00%
Pilgrim Media Group
Redeemable Noncontrolling Interest [Line Items]
Ownership percentage by noncontrolling owners				37.50%
Initial fair value of redeemable noncontrolling interests				$ 90.1
Portion of noncontrolling interest redeemable after first term, five years after November 12, 2015			25.00%								25.00%
Settlement of exercised put option					$ 36.5
Purchase of noncontrolling interest					(55.1)
Reduction in accumulated deficit					$ 18.6

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